Black Markets People will do what they can to get what they want or need, even if it means breaking the law. What are reasons that black markets

Black Markets

People will do what they can to get what they want or need, even if it means breaking the law.

What are reasons that black markets exist? Are they efficient / inefficient?  

Resource:

Reason Foundation (Producer). (2012, December 5). Meet Congress’ Favorite Bootlegger: Prohibition, Hypocrisy, and “The Man in the Green Hat” [Video file]. Retrieved from http://reason.com/reasontv/2012/12/05/the-true-story-of-congress-bootlegger-pr